Career: Shatner spent years as a jobbing actor, appearing in such movies as The Brothers Karamazov and The Intruder, as well as The Twilight Zone TV series before Star Trek made him a household name in 1966. He played Captain Kirk for three years before the show was cancelled, then appeared in numerous TV shows and movies before Star Trek: The Motion Picture relaunched his career in 1979. He starred as Kirk in six more films before the character was finally killed off in 1994. He has also featured in TJ Hooker, Free Enterprise and Miss Congeniality and its sequel. Shatner returned to TV in 2004 in the series Boston Legal. In 2010, he starred in his first sitcom, $#*! My Dad Says. Away from showbusiness, he's written several sci-fi novels, recorded a number of much-criticised albums and is a champion horse breeder.

Career: After small roles in two little-seen films, Nimoy landed the lead in the 1952 movie Kid Monk Baroni. He appeared briefly in cult classic Them! before spending two years in the US Army. When he returned to acting, he supplemented his income with odd jobs. His big break came in 1965 when Gene Roddenberry offered him the part of Mr Spock in the TV series Star Trek. When the show ended, he starred in the TV series Mission: Impossible and various long-forgotten movies and TV shows. From 1979 onwards, he returned to play Mr Spock in various projects and turned to directing, making Three Men and a Baby in 1987. He died on February 27, 2015, at the age of 83.